254 Syrphidae. . 



and below; anterior tarsi somewhat longish haired above. Wings 

 slightly tiiiged; the loop of Ihe cubital vein rather shallow and lying 

 about in the middle. Squamulæ whitish with a yellow fringe. Balteres 

 with the knob blackish, the peduncle paler. Plumula white. 



Fig. 115. Wing of D. alneti cf. 



Feinale. Vertex somewhat narrow, frons rather rapidly widening 

 downwards. Vertex black, shining, frons yellowish pruinose, blackish 

 above; from the vertex a black, shining middle line stretches down, 

 which soon divides furcately and goes with a leg down to each 

 antenna. Vertex and frons black-haired. Pleura white-haired. Ab- 

 domen as in the male, the spots a little narrower, the second band 

 sometimes divided in the middle; the fifth segment without spots. 



Length 12— 14 mm. 



D. alneti is rare in Denmark ; Dyrehaven, at Fure Sø, Geel Skov, 

 Donse, Grib Skov, Tisvilde and in Jutland at Silkeborg. My dates are 

 3/fi — i3/g_ it occurs on meadows in or near woods and at horders of 

 water, especially on Umbelliferæ. 



Geographical distribution : — Europe down into Italy ; towards 

 the north to northern Sweden, and in Finland. 



2. D. fasciata Macq. 



1834. Macq. Sult. å Buff. I, 508, 1, PI. XI, fig. 15. — 1838. Meig. Syst. 

 Beschr. VII, 142. — 1862. Schin. F. A. I, 314. — 1901. Verr. Brit. FI. VIII, 

 328, 2, figs. 272—274. — 1907. Kat. palåarkt. Dipt. III, 55. — Enica 

 Foersteri Meig. 1838. Syst. Beschr. VII, 140, 1, Tab. LXVII, Fig. 30— 32. 



Male. Similar to alneti, but slightly smaller and with more ex- 

 tended, yellow markings. Head as in alneti, but the mouth edge not 

 black, only darker yellow and the central knob yellow or only slightly 

 darkened; jowls yellow. Thorax dark greenish æneous, with indica- 

 tions of two faint grey middle stripes in front. Scutellum a little 

 paler, without bluish reflections; the hairs on thorax and scutellum 

 all yellow, or more or fewer at the margin of the latter black. Ab- 

 domen with the markings yellow, the bands on third and fourth 



